Adding a cap to mouse movement?

I'm currently working on a project called RORDHAU, which is based on the hack and slash title MORDHAU by Triternion.

In MORDHAU, a technique is used in which weapons have a certain look cap while used to prevent people from spinning around like crazy while they're attacking.

This cap is unaffected by the player's sensitivity, so my attempts to simply slow down the mouse sensitivity were fruitless, as it could be manipulated by simply changing your mouse sensitivity.

I've seen this done in a similar project created by Bromeri here: https://www.roblox.com/games/3482427464/MORDHAU

Any help would be appreciated, as this is a huge obstacle for the game's development.